Malicious PDF — malware analysis report

Static analysis result for SHA-256 3924f09fdbd67a9d…

MALICIOUS

PDF

78.8 KB Created: 2021-08-23 20:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e236fde1d54ddc2262c567b39c0ea14a SHA-1: ee14d7d52bebde410cb9d54b4001f14831150993 SHA-256: 3924f09fdbd67a9d8d97ee27a55a477f715b1db6a3d9131e80e3534e2ffa18c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded JavaScript likely redirects users to malicious external sites, serving as a lure for phishing or further malware delivery. The presence of numerous external URIs, many hosted on potentially compromised or disposable domains, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://fl-forever.com/upfiles/editor/files/modikogamafutotokilub.pdf In PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3914093167---juvupopolezupeturewite.pdfIn PDF document text
    • https://onecre.com/images/content/files/dexawimu.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba17dd222cb---5848625879.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/pisotala.pdfIn PDF document text
    • http://premium-t.info/files/files/novizikamijon.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/kifexevejixoser.pdfIn PDF document text
    • http://fabtur.ru/upload/files/4603708508.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/74433005797.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/kikubogobejopuweze.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a456e640cd9---34774335215.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5df1d56bb---85003757695.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077137a82b7f---78278019157.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/96631061344.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/mireveladisafafepawiwam.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3mqvmu25n3nuo9avll775cj32n/duvurupetutowa.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/60992857887.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/if4i3kmnsrc9ljo4ihku73hq72/49845652423.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2e58f290d---mijodubetaviladu.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/setufegovatarod.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/gunukagodurizelividujojop.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/simenitefatoweme.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/folep.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/57888865573.pdfIn PDF document text
    • https://latework.cz/soubory/najizagalusab.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8hmiet1blkahao2tup24ao8v24/pabebubabixefogalefodewog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=katzung+%26+trevor%27s+pharmacology+examination+and+board+review+14th+edition+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 16860 bytes
SHA-256: 5628a4faa445da565e084d4bc09087a3cb74c4a951e4df375eaebbee8c4c8e07
font_02_sfnt_off00011817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 9772 bytes
SHA-256: 512f7d3fe7a5c4886474f354c66e88554c67365df2904387d419a8d9da399acf

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